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+.\" $NetBSD: tc.4,v 1.9 2021/03/11 17:01:55 nia Exp $
+.\"
+.\" Copyright (c) 1996, 1997 Jonathan Stone.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"      This product includes software developed by Jonathan Stone.
+.\" 4. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd February 26, 2021
+.Dt TC 4
+.Os
+.Sh NAME
+.Nm tc
+.Nd TURBOchannel expansion bus driver
+.Sh SYNOPSIS
+.Ss alpha
+.Cd "tc* at tcasic?"
+.Ss pmax
+.Cd "tc* at mainbus0"
+.Ss vax
+.Cd "tc0 at vsbus0"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides machine-independent support for the DEC TURBOchannel
+expansion bus found on all DEC 5000-series machines with MIPS, DEC
+3000-series with Alpha processors and VAXstation 4000 machines with the
+optional TURBOchannel adaptor.
+.Pp
+Your system may support additional
+.Tn TURBOchannel
+devices.
+Drivers for
+.Tn TURBOchannel
+devices not listed here are machine-dependent.
+Consult your system's
+.Xr intro 4
+for additional information.
+.Sh HARDWARE
+.Nx
+includes machine-independent
+.Tn TURBOchannel
+drivers, sorted by device type and driver name:
+.Ss SCSI interfaces
+.Bl -tag -width pcdisplay -offset indent
+.It Xr tcds 4
+PMAZ-DS, PMAZ-FS, PMAZB-AA and PMAZC-AA dual-channel SCSI adapters
+.El
+.Ss Network interfaces
+.Bl -tag -width pcdisplay -offset indent
+.It Xr le 4
+LANCE Ethernet interface
+.El
+.Ss Frame buffers
+.Bl -tag -width pcdisplay -offset indent
+.It Xr cfb 4
+PMAG-B CX colour unaccelerated 2-D framebuffer
+.It Xr mfb 4
+PMAG-A MX monochrome framebuffer
+.It Xr px 4
+PMAG-C PX accelerated graphics boards
+.It Xr pxg 4
+PMAG-D, PMAG-E and PMAG-F PXG accelerated graphics
+boards
+.It Xr sfb 4
+PMAGB-BA HX colour unaccelerated 2-D framebuffer
+.It Xr tfb 4
+PMAG-J TX 24-bit colour unaccelerated 2-D framebuffer
+.El
+.Ss Miscellaneous
+.Bl -tag -width pcdisplay -offset indent
+.It Xr ioasic 4
+baseboard IO control ASIC for DEC TURBOchannel systems
+.It Xr tcu 4
+TC-USB USB host and GPIO option
+.El
+.Sh SEE ALSO
+.Xr intro 4 ,
+.Xr tc 9
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Nx 1.1 .
+.Sh BUGS
+The
+.Nm
+driver makes poor use of interrupt priority on the 5000/1xx series
+systems.